Improvement in dies for heading bolts



FREDERICK BRUSO, YOF BUFFALO, NEW YORK.

Lesers Patent No. 107,160, dated september 6, 1870.

IMPROVEMENT IN DIES FOR HEADING- BOLTS.

The Schedule referred co x1 these Letters Patent and making part of th sama.

I, FREDERICK Banso, ofthe city of Buffalo, in the county of Erie and State of New York, have invented a certain Improvement in Machines for Making Rivets, of which the following is a specification.

In the accompanying drawing- Figure I is a section of' the clamping-jaws and shears of an ordinary rivet-machine, represented in .the act of cutting olf a-blank rivet from a rod, which is shown in dotted lines.

Figure II is a similar view, with the parts in the posit-ion they are when the head of' the rivet is formed. v

Figure III is a face or side view of the end of the stationary shear-bar, showing a semi-annular recess formed therein.

Figure 1V is a erosssection of Fig. II. in line ,x sc.

Like letters of reference designate like parts iu each of the figures. Y

A A are two clampingjaws or beads, each provid, ed with a semicircular groove, a, of the length of the shank of the rivet. f

The head A is stationary, and has attached or secured to it, in any suitable way, a shear-bar or blade,

B, provided with a semicirenlar cutting-edge, b, which.

projects beyond the groove c in the head, as shown in Figs. yI' and II.

The clamping-head A' is provided with a shear-bar or blade B', the cutting-edge. b' of which coincides with the groove in the clamping-jaw, as represented.

The combined head A' B' thus formed has a reciprocating movement imparted to it by means of a cam or other suitable means, in the manner of the ordinary rvetfmachines in use.

The parts being in the posit-ion shown in Fig; I, the rod from which the rivets are to be formed isinserted between the cutting-edges b b', when a movement of the head A Bf toward the stationary jaw A severs a blank from-the rod, and clamps it between the two jaws, as shown in Fig. II. iVhile held in this position, the end of theblank which projects beyond the griping-bars is upset by a suitable die, which forms the head of the rivet.

The construction and operationof the machinery above described are old and well known, and requires no further description.

The action of the shears in cutting oi the blank leaves a film of metal or a thin serrated edge to the end of the blank, whichL is partially wedgedbetween the cutting-edge b and the face or side of the station ary shear-bar B, which now forms a stop, against which tbe end ot' the blank abnts, while the head of' the rivet is being formed by the pressure of the upsetting-die against the opposite end.. In thus forming the head, the upsetting-die presses against the edges of the griping-bars A A',.the latter and movable one of whichforces the cutting-edge b' against the parthis recess will be Iimmediately back of the semicircular cutting-edge of the movableshear, and, by forming a space for the serrated edge of 'the blank, prevent the wedging of the same against the cuttingedge b', and the consequent dulling of the latter.

In the drawingd represents this semi-annular groove or recess formed in the face or side of the shear-bar B.

lh'e dotted lilies in Fig III show the position of the end of the rivet as it is forced against thel bar B duru ing the operation of upsetting the head thereon.

This construction and arrangement of the groove d, by forming a space back of the cutting-'edge b', and contiguous serrated edge ot' the rivet, elfectually prevent the cutting-edge from being pressed against these overlapping particles, which can thus freely project into said recess, as are clearly illustrated in the drawing.

The importance of my improvement in `the saving of time, and labor, and war of the shear-blade, is obvious.

Tile semi-annular recess (l, formed in the face of the shear-bar B, and arranged with the cutting-edge b' and clamping-jaws A A', substantially as 'hei-einbefore set forth.

FRED. BRUSO. Witnesses:

` JAY HYATT,

JNO. J. BONNER. 

